Crank-handle.



PATENTED OCT. 10, 1905.

' c. H. SCHRADBR. CRANK HANDLE.

APPLICATION IILED 110v. 9.1904.

UNITED STATES PATENT FFICE;

CRANK-HANDLE.

Specification of Letters Patent.

Patented Oct. 10, 1905.

Application filed November 9, 1904:- Serial No. 232,049.

To all whmn it may concern:

Beit known that I, GHARLEs H. SOHRADER, a citizen of the United States,residing at Lincoln, in the county of. Lancaster and State of Nebraska,have invented certain new and useful Improvements in Crank-Handles,ofwhich the following is a specification.

This invention relates to crank-handles, and is designed particularly asa crank-handle for use on shafts or other parts to be turnedirrespective of their'form or their size within certain limits.

A further object is to produce a crank-handle of this character whichoperates eificiently and reliably and is of simple, strong, durable, andcheap construction.

To these ends the invention consists in certain novel and peculiarfeatures of construction and organization,as hereinafter described andclaimed, and in order that it may be fully understood reference is to behad to the accompanying drawings, in which Figure 1 is a perspectiveview of a crankhandle embodying my invention. Fig. 2 is a section takenon line II II of Fig. 1. Fig. 3 is a section on the line III III of Fig.2. Fig. 4 is a section on the line IV IV of Fig. 3.

In the said drawings, 1 designates the crank, and 2 the handle thereofat one end and 3 an enlargement at the opposite end. Said enlargement isprovided with a slot 4, and at the lower end said slot is formed with anupwardly projecting and tapering portion 5, having a central groove 6paralleling handle 2 and corrugated to produce a series of teeth 7. Theenlargement at its upper end is provided centrally with a threadedpassage 8, engaged by a bolt 9, having its lower end non-threaded andreduced, as at 10, and provided with an annular groove 11.

A sliding jaw 12 has its lower side formed with a substantially V-shapedgroove 13, having its walls tapering upwardly and inwardly andsubstantially paralleling the upwardly projecting and tapering portion5, which forms the lower or stationary jaw.

The groove of the sliding jaw, like that of the stationary jaw, iscorrugated to produce a series of teeth l t, the two jaws being of suchconstruction that a round, square, or other form of shaft may bereliably gripped and turned by the manipulation of the crank.

The sliding jaw is provided centrally with a vertical cylindricalpassage 15, fitting snugly on the non-threaded part of the bolt, so thatwhen the bolt is screwed down it will force the sliding jaw toward thestationary jaw, and in order to effect the withdrawal or rise of thesliding jaw with the unscrewing of the bolt said jaw is provided with apassage registering with the groove 11 of the bolt at its inner end,said passage by preference comprising a non-threaded inner portion 16and a threaded outer portion-17, a bolt 18 engaging said passage andhaving a non-threaded extension 19 engaging portion 16 of the passageand the groove 11 of bolt 9, the bolt 18 being set to one side of thecenter of bolt 9 by preference, so that the inner end of the former maybe slightly beveled, as at 20, and thereby give a more extended bearingon the grooved portion of bolt 9, it being understood, of course, thatbolt 18 is not screwed home a suflicient dis tance to bind tightly onbolt 9, as that would prevent the latter from being turned, andconsequently movement of the sliding jaw. Bolt 18 is simply for thepurpose of establishing a connection between bolt 9 and the sliding jawwhich will permit the former to turn freely and at the same time movejaw 12 toward or from the stationary jaw.

In practice the jaws are disposed a sufficient distance apart to permitthem to be slipped upon the shaft to be turned. Bolt 9 is then screwedhome until the jaws are clamped tightly upon the shaft and a rigidrelation between the crank and shaft thus established, the shaft beingthen turned by grasping handle 2 and manipulating it' in the customarymanner.

. To remove the crank, it is only necessary to unscrew bolt 9 slightlyand then slip the crank from the end of the shaft.

From the above description it will be apparent that I have produced acrank-handle possessing the features of advantage enumerated asdesirable in the statement of the object of the invention and thatchanges may be made in minor particulars without departing from itsessential spirit and scope or sacrificing any of its advantages.

Having thus described the invention, what I claim as new, and desire tosecure by Letters Patent, is

A crank-handle having a head at one end which has a longitudinal slot,and is formed at one end of said longitudinal slot with an integralstationary jaw 5 having a corrugated groove 6; in combination with a jaw12 fitting slidingly in said slot and having a transverse corrugatedgroove 1n the face contiguous to the grooved face of the stationary aw,and

provided with a cylindrical passage 15,oXtend projecting into thecylindrical passage thereof ing longitudinally of the slot; a boltdisposed and into the annular groove of said bolt. 10 longitudinally andmounted in the end of the In testimony whereof Iatfix my signature inenlargement at the opposite side of the slidthe presence of twowitnesses.

able jaw from the stationary jaw, and having CHARLES H. SCHRADER.

a non threaded annularlygrooved portion Witnesses:

journaled in said slidable jaw; and a set-screw F. WV. HUDSON,

mounted in the slidable jaw and having its end J. F. SOHRADER.

